15ct Topaz (Emerald, 16.42×12.16mm, Blue) vs 2ct Tanzanite (Round, 8.03×8.03mm, Blue)
Quick summary: When looked from above (face-up position), 15ct Topaz (16.42×12.16mm, emerald cut) appears 3.7 times larger than 2ct Tanzanite (8.03×8.03mm, round cut). See below how they compare side-by-side on a ring and finger.
| 15ct Topaz (emerald cut) |
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2ct Tanzanite (round cut) |
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blue |
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| 16.42×12.16 mm | 8.03×8.03 mm | |
| actual size | ||
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Actual size is set for screen
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Ring:
Skin tone:
Ring width: 3.0 mm
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64 mm |
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Actual sizes of
15ct Topaz Emerald (16.42×12.16mm, Blue)
and
2ct Tanzanite Round (8.03×8.03mm, Blue)
as they would appear on a ring and finger.
Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Face-up Size
All things being equal, Topaz will face-up smaller than Tanzanite for a given
carat weight, because it has higher specific gravity
(3.53 vs. 3.35 - this means it's "heavier" compared to Tanzanite of the same size). Face-up size also depends heavily on the proportions of the cut.
Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.
Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.
| 15 Ct Topaz (Emerald) | 2 Ct Tanzanite (Round) | |
| 16.42×12.16 mm | vs | 8.03×8.03 mm |
| 185.69 mm² | 50.64 mm² |
| 15ct Topaz Emerald (16.42×12.16mm) | |
| 2ct Tanzanite Round (8.03×8.03mm) | |
| Difference: 267% (135.05 mm²) |
15ct Topaz (Emerald, 16.42×12.16mm) has approx. 267% more face-up area than 2ct Tanzanite (Round, 8.03×8.03mm). In other words, it's 3.67x larger.
Popular comparisons:
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 4.5ct Topaz (Oval, Blue, 13.02 x 8.68)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 1ct Topaz (Round, Blue, 6.23 x 6.23)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 0.6ct Tanzanite (Trillion, Blue, 6.32 x 6.32)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 1.1ct Tanzanite (Trillion, Blue, 7.74 x 7.74)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 1.1ct Tanzanite (Cushion, Blue, 6.15 x 6.15)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 5ct Diamond (Emerald, White, 11.42 x 8.46)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 23ct Kunzite (Cushion, Light Purple, 17.17 x 17.17)
- 15ct Topaz (Emerald, Blue, 16.42 x 12.16) vs. 7.8ct Topaz (Oval, Blue, 15.65 x 10.43)